The situation was this suit...
Commentor said "South's best play is ♠ to the 7
Now to be fair, i have shown the suit in isolation, and not given the bidding. But the comment took me so much by suprise I had to evaluate it. I can't see how low to the spade seven is the right play. Best play has to be ACE in case WEST has singleton K, Q or doubleton KQ, and if nothing great shows up, low to the NINE. Chance for 3 tricks is fairly poor (4.1%), but a reasonable shot at 2 tricks.
What is the best way to handle this suit in isolation? When is low to the seven first, better than ACE and then low, and when can low to the NINE be worse than low to the seven?
If you are good at suit combinations, join the thread on that topic in the beginner forum. Not so much solving them, but rather showing good ones...
Ben